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SubjectRe: [PATCH 6/7] dma-direct: handle DMA_ATTR_NO_KERNEL_MAPPING in common code
On Fri, Jun 14, 2019 at 04:44:30PM +0200, Christoph Hellwig wrote:
> DMA_ATTR_NO_KERNEL_MAPPING is generally implemented by allocating
> normal cacheable pages or CMA memory, and then returning the page
> pointer as the opaque handle. Lift that code from the xtensa and
> generic dma remapping implementations into the generic dma-direct
> code so that we don't even call arch_dma_alloc for these allocations.
> Signed-off-by: Christoph Hellwig <>

This patch results in build failures for mips:nlm_xlp_defconfig and

kernel/dma/direct.c:144: undefined reference to `arch_dma_prep_coherent'

Reverting the patch fixes the problem.


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